Device for recovering pump-cylinders



H. NELSON.

DEVICE FOR RECOVERING PUMP CYLINDERS. APPLICATION FILED JUNE 18, 1917.

Patented Sept. 21, 1920.

UNITED STATES:

. A E T ,Q F CEL HENRY NELSON, OF NORTI-IWQOD, IOWA, ASSIGNOR OF ONE-HALF TO T. SOPHUS HANSON, OF NORTHWCOD, IOWA.

DEVICE FOR RECOVERING PUMP- GYLTN-DERS.

Specification of Letters Patent. Patented Sept. 21,. 1920.

Application filed June is, 1917. Serial a... 175,526.

To all whom it may concern Be it known that I, HENRY NELSON, a citizen of the United States, residing in the city of Northwood, county of Worth, and State oflowa, have invented certain new and useful Improvements in Devices for Becovering Pump-Gylinders, of which the following is a specification.

This invention relates to devices for recovering pump cylinders or the like and relates more particularly to a tool by means of which the pump cylinder can be automatically locked to a lifting member when it has become disengaged from the pipe section.

Among the objects of the invention are to provide a recovering tool which can be dropped down into interlocking engagement with the cylinder casing when the latter has been accidentally disengaged; to provide a construction having grooved peripheral portions or segments, which when the tool is plunged down into the casing, will auto matically interlock with the internal threads in the casing; to provide a tool which can be used for recovering casings of various diameters, the adjustment being preferably automatic for sizes within predetermined limits and preferably having means for adjusting, whereby it can be automatically engaged with the larger series of casings. The invention also resides in various other details of construction and such combinations and arrangements of parts as hereinafter set forth.

In the drawings:

Figure 1 is an enlarged side elevational view, partly in section showing the tool' engaged with the cylinder casing.

Fig. 2 is a side elevational view of the recovery tool, parts being broken away. 1

Fig. 3 is a cross section on the line 66 of Fig. 5. r

Fig. 4: is a side elevational View at right angles to Fig. 2.

Fig. 5 is a cross-section on line 55 of Fig. 4, looking in the direction of the arrow.

In any common type of well, the cylinder casing 1 may become disengaged from the threaded cap on the upper pipe section to which it is screwed, permitting the cylinder casing to fall down out of engagement with the pump valve. It is often difiicult to secure a hold upon the cylinder section which has become thus disengaged so as to be able to lift it to the top'of the well for reengagelment with the cap. In the present construc'-' tion, I have disclosed a tool 4 for automatically locking the cylinder casing to a lifting rod 5 by means of which it can lie-withdrawn to the top of the well. To engage the recovering tool 4 with the cylinder casing, the pump, upper pipe section and valve plunger are withdrawn from the outer casing of the well. The recovering tool 4, which is secured to the lower end of the lifting rod 5 is then inserted into the outer casing of the well until its lower end moves downward into the upper end of the cylinder casing 1. The latter is provided on its inner surface with threads 9, by means of which it is normally secured to the cap on the lower end of the upper pipe section and I utilize an engagement with these threads for fastening the recovering tool to the cylinder casing. ,In detail, the recovering tool comprisesa body portion 10, which is formed of cylindrical stock having its lower end flattened out to provide spaced plates 11 and 12. Between these plates there is pivoted a series of pairs of gripping jaws, each pair of the series comprising a jaw 13 and an opposite jaw 14, having a common pivot 15. The outer ends of these jaws are serrated or formed with the segment of a screw thread, which is adapted to engage with the internal threads 9 of the cylinder to be recovered. The outer ends of these jaws are normally spring-pressed outward by the ends of springs 16, coiled upon the bolt 17 extending between the side plates. The downward movement of the outer ends of the gripping jaws is limited by lugs 18 and 19, struck inwardly from the side plates, which plates at their lower end are somewhat tapered at 20 to facilitate the guiding of the toolinto the upper end of the casing.

The arrangement is such that when the recovering toolis either dropped or forced downward into the upper end of the cylinder casing, the curved edges of the jaws will strike against the threaded portion of the cylinder. This will cause them to move back against the tension of the springs, which springs will then hold them tightly locked in engagement with the threaded portion of the casing, so that upon the upward movement of the recovery tool the casing will be positively drawn up with the tool. The pivotal arrangement of the grip ping jaws allows them to yield sufficiently to avoid injury to the threads of the casing and has a further advantage in that the same tool can be employed for recovering casings.

of diflerent sizes within predetermined limits. To prevent the side plates 11 and 12 being drawn together close enough to interfere with the free pivotal movement of the gripping jaws, the pivot bolts 15 are pro vided with spacer washers 21. Also to per- The invention, however, is not limited to this partirular adjustment as various changes in this and other features of construction can be vmade without departing from the scope of my invention.

I claim as my invention:

A tool for recovering cylinder casings comprising a body portion having spaced side plates, spaced pivot rods extending there-between, a pair of oppositely extending gripping jaws pivotally connected to each. pivot member and having downwardly converging ratched edges, leaf springs mounted on the side plates and adapted to normally force the respective gripping jaws downwardly, lugs on the side plates for limiting the downward movement of the gripping jaws and means for adjusting said gripping jaws to take care of casings of dilferent diameters.

HENRY NELSON. 

